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'[EE] BNC Connector distance...'
2006\01\10@170529 by Mauricio Jancic

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Hi,

           Can anyone tell me what would be the minimum distance between
BNC connectors? I have a panel with 16 columns of 3 rows of connectors and I
would like to know the minimum distance. anyone?



Regards,



Mauricio Jancic

Janso Desarrollos

Microchip Consultant Program Member

spam_OUTinfoTakeThisOuTspamjanso.com.ar

http://www.janso.com.ar

+54 11 4542 3519



2006\01\10@171352 by Mike Hagen

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That depends, are you going to be taking them off and on all the time.  Or
is a patch panel that seldom gets used.  If you want fast easy access add
more space for fingers.  If they are seldom used reduce space.  Use an
oscilloscope or a piece of test gear for estimation?


{Original Message removed}

2006\01\10@172404 by Mauricio Jancic

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It's a camera mux, so it not going to be used often...

Mauricio Jancic
Janso Desarrollos
Microchip Consultant Program Member
.....infoKILLspamspam@spam@janso.com.ar
http://www.janso.com.ar
+54 11 4542 3519
> {Original Message removed}

2006\01\10@172839 by Bob Blick

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>             Can anyone tell me what would be the minimum distance between
> BNC connectors? I have a panel with 16 columns of 3 rows of connectors and
> I
> would like to know the minimum distance. anyone?

The minimum I just measured on any equipment in my lab is 28mm.

Cheers,

Bob


2006\01\10@172914 by Bob Blick

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That was 28 mm center-to-center.

2006\01\10@174729 by Mauricio Jancic

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I have here a panel with 20mm separation, and it can be used. I think closer
can be used too, but I wanted to be sure...

Mauricio Jancic
Janso Desarrollos
Microchip Consultant Program Member
infospamKILLspamjanso.com.ar
http://www.janso.com.ar
+54 11 4542 3519

> {Original Message removed}

2006\01\10@180016 by Bob Blick

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> I have here a panel with 20mm separation, and it can be used. I think
> closer
> can be used too, but I wanted to be sure...

Some of the plugs on my scope probes are almost 19mm in diameter. But
you're not plugging scope probes into your panel :)

-Bob


2006\01\10@180415 by Robert Young

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>
>
> Hi,
>
>             Can anyone tell me what would be the minimum
> distance between BNC connectors? I have a panel with 16
> columns of 3 rows of connectors and I would like to know the
> minimum distance. anyone?
>
The smallest I have ever seen is 0.75" (about 20mm).  If you want to
easily get your fingers around them, then you should have 1.0" or more.

Rob

2006\01\10@182230 by Robert Rolf

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I must concur with the other Rob. I have built several panels
with BNC arrays, the tightest of which was 0.75" grid. NEVER again.
You need quite long thin fingers to twist the shell on/off in the middle.
The 1.0" spaced panels I've made work ok for most of the hands found in
this lab over the years.

0.75 works OK if it's on a 1U panel as a single row.
I've also done 1.0 x 0.75 on a 1U (2 rows, one at each edge)
with success, as long as there isn't anything sticking out far
on the adjacent panel.

Robert Young wrote:

{Quote hidden}

2006\01\10@191338 by Howard Winter

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Mauricio,

On Tue, 10 Jan 2006 19:47:25 -0300, Mauricio Jancic wrote:

> I have here a panel with 20mm separation, and it can be used. I think closer
> can be used too, but I wanted to be sure...

That seems very close - can you get your fingers onto the locking rings and operate them comfortably with that
little gap?  (I have large fingers, so it's an issue for me! :-)

Cheers,


Howard Winter
St.Albans, England


2006\01\10@192622 by Robert Young

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> Mauricio,
>
> On Tue, 10 Jan 2006 19:47:25 -0300, Mauricio Jancic wrote:
>
> > I have here a panel with 20mm separation, and it can be
> used. I think
> > closer can be used too, but I wanted to be sure...
>
> That seems very close - can you get your fingers onto the
> locking rings and operate them comfortably with that
> little gap?  (I have large fingers, so it's an issue for me! :-)
>
> Cheers,
>
>
> Howard Winter
> St.Albans, England
>
That is about as close as you can get them and still be able to slip on
the "average" BNC cable.  Any closer and the outer ring of the cable may
bite into its neighbor when rotated to lock.  At that spacing you can
grab from the top and bottom but not wrap your hammy little fingers
around the whole connector.  Fine for a single row but don't space each
row at 20mm unless you plan to supply a tool for inserting and removing
the cables.  They do make such tools by the way.

If you are going to have a large array of connectors, consider switching
to SMA, SMB, SMC, MCX, etc.  SMB works pretty well if you don't need to
change cables frequently and can live without the mechanical (thread)
locking of SMA.  The push-on, pull-off is nice, no rotating or other
alignment issues.  But it is easy to destroy a cable by yanking on it or
smash the center pin if you get to aggressive with a poorly aligned
connector.

Rob

2006\01\10@213702 by Dwayne Reid

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At 03:05 PM 1/10/2006, Mauricio Jancic wrote:

>             Can anyone tell me what would be the minimum distance between
>BNC connectors? I have a panel with 16 columns of 3 rows of connectors and I
>would like to know the minimum distance. anyone?

The permanently mounted video switchers I've seen use 0.75" spacing
(I measured it).  Hanging on a hook near the rear of the switcher is
a cute tool used to twist the BNC connectors on and off.  Think of a
sleeve that is knurled on the inside to match the knurl on a standard
BNC connector.  That sleeve has a slot wide enough to pass the video
cable (Belden video blue - don't remember the number).

The sleeve is welded to the end of what looks like a long screwdriver.

In fact, just like <http://www.smarthome.com/89258.html>

Its darned easy to reach in and loosen or tighten any connector you
wish to - even in the middle of the panel.

dwayne

--
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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2006\01\11@165224 by Peter

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On Tue, 10 Jan 2006, Mauricio Jancic wrote:

> It's a camera mux, so it not going to be used often...

This is a place where inches are useful. Putting connectors about 1.5
inches apart will allow you to grab them with 2 fingers and
insert/remove them easily. If the connectors are larger and require more
than 2 fingers leave more space. The 1-finger rule is roughly 'leave 1
inch for each side (between connector bodies)'. That will make most
people's fingers fit in with some room to spare so they can move and
twist the bayonet lock. Others may disagree. I have learned to loathe
bnc arrays mounted too close to each other (f.ex. 1 in between centers).
Once one of them sticks you will have fun.

Peter

2006\01\13@044828 by Nate Duehr

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Mauricio Jancic wrote:
> Hi,
>
>             Can anyone tell me what would be the minimum distance between
> BNC connectors? I have a panel with 16 columns of 3 rows of connectors and I
> would like to know the minimum distance. anyone?

If your product makes me cram my fat fingers between two hard BNC
connectors and/or have to dig out my BNC removal tool from my tool bag
while I'm trying to get work done...

It'll get my very verbal vote to never buy it again to all within
earshot at the time.

How's that for an answer?  ;-)

Also give me enough room to dress cables properly when they come out of
the BNC connectors or I get grumpy too.  BNC panels mounted within a few
inches of a hard back plate with no room for a bundle of 50 coax cables
to make the corner without smashing them to death... that makes me
unhappy too.

Seriously though -- if people are connecting to it and you don't expect
the connections to be removed very often, you can force them to use a
BNC tool... it looks like a off-set stick with a hoop of springy metal
on the end, designed to "grip" around a BNC so you can give it the
appropriate twist, on or off, and still stay out of the way of the
coaxial cable while using it.

They're a complete utter pain in the butt, and you have to use them on
many high-density DS-3 "patch" panels in telecommunications sites.

Nate
(Who's cussed out a lot of so-called DS-3 "patch" panel engineers in his
day, and had many a squished finger that was sore for a day or two
because some dork designed BNC connectors too close together.)

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